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+NAME="NET-COMMON-TCPIP-MANPAGES-IOCTL">ioctl</H1
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+>IOCTL(2) System Calls Manual IOCTL(2)
+
+NAME
+ ioctl - control device
+
+SYNOPSIS
+ #include <sys/ioctl.h>
+
+ int
+ ioctl(int d, unsigned long request, ...);
+
+DESCRIPTION
+ The ioctl() function manipulates the underlying device parameters of spe-
+ cial files. In particular, many operating characteristics of character
+ special files (e.g., terminals) may be controlled with ioctl() requests.
+
+ The argument d must be an open file descriptor. The third argument is
+ called arg and contains additional information needed by this device to
+ perform the requested function. arg is either an int or a pointer to a
+ device-specific data structure, depending upon the given request.
+
+ An ioctl request has encoded in it whether the argument is an ``in''
+ parameter or ``out'' parameter, and the size of the third argument (arg)
+ in bytes. Macros and defines used in specifying an ioctl request are
+ located in the file <sys/ioctl.h>.
+
+RETURN VALUES
+ If an error has occurred, a value of -1 is returned and errno is set to
+ indicate the error.
+
+ERRORS
+ ioctl() will fail if:
+
+ [EBADF] d is not a valid descriptor.
+
+ [ENOTTY] d is not associated with a character special device.
+
+ [ENOTTY] The specified request does not apply to the kind of
+ object that the descriptor d references.
+
+ [EINVAL] request or arg is not valid.
+
+ [EFAULT] arg points outside the process's allocated address
+ space.
+
+SEE ALSO
+ cdio(1), chio(1), mt(1), execve(2), fcntl(2), intro(4), tty(4)
+
+HISTORY
+ An ioctl() function call appeared in Version 7 AT&T UNIX.
+
+BSD December 11, 1993 BSD
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